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Codegen -0.0 correctly. Do not use fldz! This is another -0.0 == +0.0 problem, arg.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11070 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-02 18:56:30 +00:00
parent c07cd132cb
commit af70362e40
2 changed files with 8 additions and 8 deletions
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8
lib/Target/X86/InstSelectSimple.cpp
View File

@ -438,10 +438,9 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CI->getRawValue());
}
} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
double Value = CFP->getValue();
if (Value == +0.0)
if (CFP->isExactlyValue(+0.0))
BMI(MBB, IP, X86::FLD0, 0, R);
else if (Value == +1.0)
else if (CFP->isExactlyValue(+1.0))
BMI(MBB, IP, X86::FLD1, 0, R);
else {
// Otherwise we need to spill the constant to memory...
@ -1212,7 +1211,7 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB,
// sub 0, X -> neg X
if (OperatorClass == 1 && Class != cLong)
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0))
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0)) {
if (CI->isNullValue()) {
unsigned op1Reg = getReg(Op1, MBB, IP);
switch (Class) {
@ -1228,6 +1227,7 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB,
return;
}
}
}
if (!isa<ConstantInt>(Op1) || Class == cLong) {
static const unsigned OpcodeTab[][4] = {

8
lib/Target/X86/X86ISelSimple.cpp
View File

@ -438,10 +438,9 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CI->getRawValue());
}
} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
double Value = CFP->getValue();
if (Value == +0.0)
if (CFP->isExactlyValue(+0.0))
BMI(MBB, IP, X86::FLD0, 0, R);
else if (Value == +1.0)
else if (CFP->isExactlyValue(+1.0))
BMI(MBB, IP, X86::FLD1, 0, R);
else {
// Otherwise we need to spill the constant to memory...
@ -1212,7 +1211,7 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB,
// sub 0, X -> neg X
if (OperatorClass == 1 && Class != cLong)
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0))
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0)) {
if (CI->isNullValue()) {
unsigned op1Reg = getReg(Op1, MBB, IP);
switch (Class) {
@ -1228,6 +1227,7 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB,
return;
}
}
}
if (!isa<ConstantInt>(Op1) || Class == cLong) {
static const unsigned OpcodeTab[][4] = {